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8213086: Compiler thread creation should be bounded by available space in memory and Code Cache

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Reviewed-by: kvn, thartmann
This commit is contained in:
Martin Doerr 2018-10-31 14:48:36 +01:00
parent 4da555c7a8
commit a241cf4367
1 changed files with 14 additions and 8 deletions
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22
src/hotspot/share/compiler/compileBroker.cpp
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@ -894,14 +894,19 @@ void CompileBroker::possibly_add_compiler_threads() {
EXCEPTION_MARK;
julong available_memory = os::available_memory();
// If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
// Only do attempt to start additional threads if the lock is free.
if (!CompileThread_lock->try_lock()) return;
if (_c2_compile_queue != NULL) {
int old_c2_count = _compilers[1]->num_compiler_threads();
int new_c2_count = MIN3(_c2_count,
int new_c2_count = MIN4(_c2_count,
_c2_compile_queue->size() / 2,
(int)(available_memory / 200*M));
(int)(available_memory / (200*M)),
(int)(available_cc_np / (128*K)));
for (int i = old_c2_count; i < new_c2_count; i++) {
JavaThread *ct = make_thread(compiler2_object(i), _c2_compile_queue, _compilers[1], true, CHECK);
@ -910,17 +915,18 @@ void CompileBroker::possibly_add_compiler_threads() {
if (TraceCompilerThreads) {
ResourceMark rm;
MutexLocker mu(Threads_lock);
tty->print_cr("Added compiler thread %s (available memory: %dMB)",
ct->get_thread_name(), (int)(available_memory/M));
tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_np/M));
}
}
}
if (_c1_compile_queue != NULL) {
int old_c1_count = _compilers[0]->num_compiler_threads();
int new_c1_count = MIN3(_c1_count,
int new_c1_count = MIN4(_c1_count,
_c1_compile_queue->size() / 4,
(int)(available_memory / 100*M));
(int)(available_memory / (100*M)),
(int)(available_cc_p / (128*K)));
for (int i = old_c1_count; i < new_c1_count; i++) {
JavaThread *ct = make_thread(compiler1_object(i), _c1_compile_queue, _compilers[0], true, CHECK);
@ -929,8 +935,8 @@ void CompileBroker::possibly_add_compiler_threads() {
if (TraceCompilerThreads) {
ResourceMark rm;
MutexLocker mu(Threads_lock);
tty->print_cr("Added compiler thread %s (available memory: %dMB)",
ct->get_thread_name(), (int)(available_memory/M));
tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_p/M));
}
}
}